// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_VIEWS_COREWM_TOOLTIP_WIN_H_
#define UI_VIEWS_COREWM_TOOLTIP_WIN_H_

#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/strings/string16.h"
#include "ui/gfx/geometry/point.h"
#include "ui/views/corewm/tooltip.h"

#include <commctrl.h>
#include <windows.h>

namespace views {
namespace corewm {

    // Implementation of Tooltip that uses the native win32 control for showing the
    // tooltip.
    class VIEWS_EXPORT TooltipWin : public Tooltip {
    public:
        explicit TooltipWin(HWND parent);
        ~TooltipWin() override;

        // HandleNotify() is forwarded from DesktopWindowTreeHostWin to keep the
        // native tooltip in sync.
        bool HandleNotify(int w_param, NMHDR* l_param, LRESULT* l_result);

    private:
        // Ensures |tooltip_hwnd_| is valid. Returns true if valid, false if there
        // a problem creating |tooltip_hwnd_|.
        bool EnsureTooltipWindow();

        // Sets the position of the tooltip.
        void PositionTooltip();

        // Tooltip:
        int GetMaxWidth(const gfx::Point& location) const override;
        void SetText(aura::Window* window,
            const base::string16& tooltip_text,
            const gfx::Point& location) override;
        void Show() override;
        void Hide() override;
        bool IsVisible() override;

        // The window |tooltip_hwnd_| is parented to.
        HWND parent_hwnd_;

        // Shows the tooltip.
        HWND tooltip_hwnd_;

        // Used to modify the tooltip.
        TOOLINFO toolinfo_;

        // Is the tooltip showing?
        bool showing_;

        // Location to show the tooltip at. In order to position the tooltip we need
        // to know the size. The size is only available from TTN_SHOW, so we have to
        // cache it.
        gfx::Point location_;

        DISALLOW_COPY_AND_ASSIGN(TooltipWin);
    };

} // namespace corewm
} // namespace views

#endif // UI_VIEWS_COREWM_TOOLTIP_WIN_H_
